P0235 Fault Code

P0235 OBD-II Trouble Code Short Description

Turbocharger Boost Sensor A Circuit Malfunction

What does trouble code P0235 mean?

The P0235 fault code is related to the turbocharger boost pressure sensor circuit. This sensor measures the pressure of the air entering the engine through the turbocharger, and sends this information to the engine control module. When the sensor circuit malfunctions, the ECM cannot accurately regulate the boost pressure, resulting in poor engine performance and potential damage to the engine and turbocharger.

The solution to this issue typically involves checking the wiring and connections of the boost pressure sensor, as well as testing the sensor itself. If the sensor is faulty, it will need to be replaced. It is also important to address any underlying issues that could be causing the sensor malfunction, such as clogged or damaged intake or exhaust systems, and to ensure proper maintenance of the turbocharger.

If this issue is not addressed promptly, it can lead to serious engine damage and expensive repairs. Therefore, it is important to have the vehicle inspected and repaired by a qualified technician as soon as possible.


What are the symptoms of the P0235 code?

The symptoms of a P0235 fault code may include:

  • Check Engine Light (CEL) illumination
  • Reduced engine power or hesitation during acceleration
  • Poor fuel economy
  • Strange engine noises
  • Turbocharger failure or damage
  • Boost pressure gauge not working or reading incorrectly.


What causes the P0235 code?

Possible causes for this fault code are:

  1. Faulty turbocharger boost sensor
  2. Wiring issues associated with the boost sensor circuit, such as open or short circuits
  3. Poor electrical connection in the boost sensor circuit
  4. Failed turbocharger or wastegate malfunctioning
  5. Malfunctioning boost pressure control valve or solenoid
  6. Defects in the engine control module (ECM)

It is recommended to get the vehicle diagnosed by a qualified mechanic to properly identify the root cause of the issue and perform necessary repairs.

Possible Solutions

How to fix P0235?

Fixing P0235 fault code on cars involves several steps that depend on the underlying cause of the problem. Here are some possible solutions:

  1. Check the boost sensor: The fault code indicates a problem with the turbocharger boost sensor. Check the wiring, connector, and the sensor itself for any damage or corrosion.

  2. Clean the sensor: Dirt, oil, and debris can accumulate on the sensor, causing it to malfunction. Use a cleaner specifically designed for turbochargers to clean it.

  3. Replace the sensor: If the sensor is damaged or non-functional after cleaning, replace it with a new one.

  4. Check the vacuum lines and hoses: Leaks or clogs in the vacuum lines and hoses can restrict the airflow to the turbocharger, causing the sensor to malfunction. Inspect them and replace any damaged or clogged components.

  5. Check the turbocharger waste gate: A faulty waste gate can cause the turbocharger to over-boost, resulting in a malfunctioning boost sensor. Inspect the waste gate for any damage or wear and replace it if necessary.

  6. Check the engine management system: If all other components are in good working order, the engine management system may be the culprit. Inspect the system for any malfunctioning components and replace or repair them accordingly.

It is recommended to take your vehicle to a certified mechanic for proper diagnosis and repairs.


  • What does P0235 code mean?

    P0235 code refers to Turbocharger Boost Sensor A Circuit Malfunction. This means the engine control module (ECM) has detected an abnormal reading from the boost pressure sensor or its circuit.

  • What causes P0235 code?

    There are several potential causes for P0235 code which may include, but not limited to, a faulty boost pressure sensor, damaged wiring or connectors in the boost pressure sensor circuit, failed turbocharger, vacuum leaks, or ECM malfunction.

  • Can P0235 code cause damage to the engine?

    P0235 code could potentially cause damage to the engine if the underlying issue is not fixed. A faulty turbocharger could create excessive pressure or overheating which may result in engine damage.

  • How to diagnose P0235 code?

    Diagnosing P0235 code involves using a diagnostic scanner to retrieve the code, checking the boost pressure sensor and its circuit for continuity, inspecting the turbocharger for any damage, and checking for vacuum leaks.

  • How to fix P0235 code?

    Fixing P0235 code may involve replacing a faulty boost pressure sensor, repairing or replacing damaged wiring or connectors, fixing vacuum leaks, or replacing the turbocharger if defective. The exact fix depends on the underlying issue causing the code.

  • Can P0235 code be ignored?

    P0235 code should not be ignored as it may lead to engine performance issues, decreased fuel efficiency, or engine damage if left unaddressed.

  • How much does it cost to fix P0235 code?

    The cost of fixing P0235 code depends on the cost of parts and labor charges involved, and the underlying issue causing the code. It could range from $100 to $1000 or more.

  • Will P0235 code trigger the check engine light?

    Yes, P0235 code will trigger the check engine light and may result in the vehicle failing an emissions test.